<template>
  <div class="search-container">
    <!-- 搜索栏 -->
    <form class="search-form" action="/">
      <van-search
        v-model="searchText"
        show-action
        background="#3296fa"
        placeholder="请输入搜索关键词"
        @search="onSearch"
        @cancel="onCancel"
        @focus="isResultShow = false"
      />
    </form>

    <!-- 搜索结果 -->
    <search-result :search-text="searchText" v-if="isResultShow" />

    <!-- 联想建议 -->
    <search-suggestion
      v-else-if="searchText"
      :searchText="searchText"
      @search="onSearch"
    />

    <!-- 历史记录 -->
    <search-history v-else 
    :search-histories="searchHistories"
    @clear-search-history="searchHistories= []"   @search="onSearch"/>
  </div>
</template>

<script>
import SearchHistory from "./components/search-history";
import SearchSuggestion from "./components/search-suggestion";
import SearchResult from "./components/search-result";
import {setItem,getItem} from "@/utils/storage"
export default {
  name: "SearchIndex",
  data() {
    return {
      searchText: "",
      isResultShow: false, //控制搜索结果的展示
      searchHistories:getItem('TOUTIAO_SEARCH_HISTORIES') || [], // 搜索的历史记录数据
    };
  },
  created() {},
  computed: {},
  watch:{
    searchHistories(value){
      setItem('TOUTIAO_SEARCH_HISTORIES',value)
    }
  },
  methods: {
    onSearch(val) {
      //更新文本框内容
      this.searchText = val;

      // 储存搜索结果
      // 不要有重复的历史记录
      const index = this.searchHistories.indexOf(val);
      if (index !== -1) {
        this.searchHistories.splice(index,1)
      }

      this.searchHistories.unshift(val);

      // 渲染搜索结果
      this.isResultShow = true;
    },
    onCancel() {
      this.$router.back();
    },
  },
  components: {
    SearchHistory,
    SearchResult,
    SearchSuggestion,
  },
};
</script>

<style lang='less' scoped>
.search-container {
  padding-top: 108px;
  .van-search__action {
    color: #fff;
  }
  .search-form {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1;
  }
}
</style>